Ubuntu Security Notices USN-8015-2 USN-8015-2: Linux kernel (Real-time) vulnerabilities Publication date 4 February 2026 Overview Several security issues were fixed in the Linux kernel. Releases 24.04 LTS 22.04 LTS Packages linux-raspi-realtime - Linux kernel for Raspberry Pi Real-time systems linux-realtime - Linux kernel for Real-time systems linux-realtime-6.8 - Linux kernel for Real-time systems Details Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: Cryptographic API; SMB network file system; io_uring subsystem Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: Cryptographic API; SMB network file system; io_uring subsystem Update instructions After a standard system update you need to reboot your computer to make all the necessary changes. Learn more about how to get the fixes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 24.04 LTS noble linux-image-6.8.0-2036-raspi-realtime – 6.8.0-2036.37 linux-image-6.8.1-1040-realtime – 6.8.1-1040.41 linux-image-intel-iot-realtime – 6.8.1-1040.41 linux-image-raspi-realtime – 6.8.0-2036.37 linux-image-raspi-realtime-6.8 – 6.8.0-2036.37 linux-image-realtime – 6.8.1-1040.41 linux-image-realtime-6.8.1 – 6.8.1-1040.41 22.04 LTS jammy linux-image-6.8.1-1040-realtime – 6.8.1-1040.41~22.04.1 linux-image-realtime-6.8.1 – 6.8.1-1040.41~22.04.1 linux-image-realtime-hwe-22.04 – 6.8.1-1040.41~22.04.1 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2025-40019 CVE-2025-39698 CVE-2025-38561 CVE-2025-40019 CVE-2025-39698 CVE-2025-38561 USN-8016-1 USN-8015-1 USN-8014-1 USN-8013-1 USN-8013-2 USN-8013-3 USN-7990-1 USN-7990-2 USN-7934-1 USN-7880-1 USN-8016-1 USN-8015-1 USN-8014-1 USN-8013-1 USN-8013-2 USN-8013-3 USN-7990-1 USN-7990-2 USN-7934-1 USN-7880-1 USN-7879-1 USN-7879-2 USN-7879-3 USN-7879-4 Have additional questions? Talk to a member of the team ›